server: add an initial GTK UI front-end.

1 files changed, 149 insertions, 0 deletions

diff --git a/src/server/gtk.c b/src/server/gtk.c
new file mode 100644
index 0000000..8b850cf
--- /dev/null
+++ b/src/server/gtk.c
@@ -0,0 +1,149 @@
+/*
+ * Hot Beverage Companion – desktop application gtk ui
+ *
+ * Copyright (C) 2018 Gediminas Jakutis
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; version 2.1
+ * of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <gtk/gtk.h>
+#include <time.h>
+#include <string.h>
+#include "util.h"
+#include "gtk.h"
+
+struct settings {
+	int nd;
+	struct timespec period;
+};
+
+struct gtkui {
+	GtkBuilder *builder;
+	GObject *window;
+	GObject *tempvalue;
+	GObject *resistance;
+	GObject *voltage;
+	GObject *reslabel;
+	GObject *voltlabel;
+	GObject *showmorebutton;
+	GObject *button_on;
+	GObject *button_off;
+	GObject *ticker;
+	GError *error;
+	int showmore;
+};
+
+static struct settings settings;
+static struct gtkui gtkui;
+
+static int gtkui_update(void *data);
+static void gtkui_die(void *data);
+static void gtkui_togglemore(void);
+
+int gtkui_init(int *argc, char ***argv, int nd, struct timespec period)
+{
+	int ret = A_OK;
+
+	settings.nd = nd;
+	settings.period = period;
+
+	if (!gtk_init_check(argc, argv)) {
+		ret = ERROR;
+		goto fail;
+	}
+
+	gtkui.builder = gtk_builder_new();
+
+	if (!gtk_builder_add_from_file(gtkui.builder, "gtklayout.ui", &gtkui.error)) {
+		ret = ERROR;
+		goto fail;
+	}
+
+	gtkui.window = gtk_builder_get_object(gtkui.builder, "window");
+	gtkui.tempvalue = gtk_builder_get_object(gtkui.builder, "tempvalue");
+	gtkui.resistance = gtk_builder_get_object(gtkui.builder, "resistance");
+	gtkui.voltage = gtk_builder_get_object(gtkui.builder, "voltage");
+	gtkui.reslabel = gtk_builder_get_object(gtkui.builder, "reslabel");
+	gtkui.voltlabel = gtk_builder_get_object(gtkui.builder, "voltlabel");
+	gtkui.showmorebutton = gtk_builder_get_object(gtkui.builder, "showmore");
+	gtkui.button_on = gtk_builder_get_object(gtkui.builder, "button_on");
+	gtkui.button_off = gtk_builder_get_object(gtkui.builder, "button_off");
+	gtkui.ticker = gtk_builder_get_object(gtkui.builder, "ticker");
+	g_signal_connect(gtkui.window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
+	g_signal_connect(gtkui.showmorebutton, "toggled", G_CALLBACK(gtkui_togglemore), NULL);
+	gtkui.showmore = 1; /* we are setting this so we can toggle this off on the following call */
+	gtkui_togglemore();
+
+fail:
+	return ret;
+}
+int gtkui_loop(void)
+{
+	int ret;
+	g_timeout_add_full(G_PRIORITY_DEFAULT, settings.period.tv_nsec / (1000 * 1000), gtkui_update, &ret, gtkui_die);
+	gtk_main();
+
+	return ret;
+}
+
+static int gtkui_update(void *data)
+{
+	static const char ticker[] = "|/-\\";
+	static const char waitmsg[] = "Waiting.";
+	static int statechange = 1;
+	static struct tempmodule_state state;
+	char textbuf[32];
+	int *ret;
+
+	ret = data;
+	*ret = refresh_data(settings.nd, &state);
+	if (*ret == A_OK) {
+		textbuf[0] = ticker[state.sequence % strlen(ticker)];
+		textbuf[1] = '\0';
+		gtk_label_set_text(GTK_LABEL(gtkui.ticker), textbuf);
+		sprintf(textbuf, "%.1f°C", state.temperature);
+		gtk_label_set_text(GTK_LABEL(gtkui.tempvalue), textbuf);
+		sprintf(textbuf, "%hdΩ", state.resistance);
+		gtk_label_set_text(GTK_LABEL(gtkui.resistance), textbuf);
+		sprintf(textbuf, "%.3fV", state.voltage);
+		gtk_label_set_text(GTK_LABEL(gtkui.voltage), textbuf);
+		statechange = 1;
+	} else if (*ret == DEAD && statechange) {
+		gtk_label_set_text(GTK_LABEL(gtkui.tempvalue), waitmsg);
+		gtk_label_set_text(GTK_LABEL(gtkui.resistance), waitmsg);
+		gtk_label_set_text(GTK_LABEL(gtkui.voltage), waitmsg);
+		statechange = 0;
+	}
+
+	return *ret != ERROR;
+}
+
+static void gtkui_die(void *data)
+{
+	(void) data; /* silence unused variable warning */
+	gtk_main_quit();
+	return;
+}
+
+static void gtkui_togglemore(void)
+{
+	gtkui.showmore = !gtkui.showmore;
+	gtkui.showmore ? gtk_button_set_image(GTK_BUTTON(gtkui.showmorebutton), GTK_WIDGET(gtkui.button_on)) :
+				gtk_button_set_image(GTK_BUTTON(gtkui.showmorebutton), GTK_WIDGET(gtkui.button_off));
+	gtk_widget_set_visible (GTK_WIDGET(gtkui.resistance), gtkui.showmore);
+	gtk_widget_set_visible (GTK_WIDGET(gtkui.voltage), gtkui.showmore);
+	gtk_widget_set_visible (GTK_WIDGET(gtkui.reslabel), gtkui.showmore);
+	gtk_widget_set_visible (GTK_WIDGET(gtkui.voltlabel), gtkui.showmore);
+}